Back in 1970, author Alvin Toffler coined the term "future shock."
He envisioned a dystopian future in which technological and sociological change would be too rapid to cope with, and people would be utterly overwhelmed by daily life.
In the last decade or two, the pace of technological change has accelerated rapidly compared to the era in which Toffler was writing.
Artificial intelligence, social media, self-driving cars, genetic modification you can perform in a garage — even the most optimistic futurists may acknowledge that some technologies are heading toward a tipping point, in which it becomes difficult to predict how they'll be used or what unintended consequences may occur.
Shows like "Black Mirror" routinely take a fictional look at these dark technological scenarios, but the show might not be so far-fetched after all. We talked to scientists, technologists, and researchers to see what terrifying but plausible applications for emerging technologies keep them awake at night.